If the main factor determining the H\(\) /H\(\)  ratio is the reddening – as we are advocating here – then changes in the ratio imply changes in the reddening. This was proposed by [1]} as a cause of what are now referred to as “changing-look" AGNs. In the present paper we are focusing on validating reddening indicators and estimating a mean reddening of NGC 5548. We will therefore defer discussion of evidence for variable reddening for the future. We note, however, that [2]} present evidence for H\(\) /H\(\)  varying in NGC 5548 both over time and with velocity. [3]} show this is consistent with variable partial obscuration of the BLR – something supported by absorption line and X-ray variability. Given the possibility of variations in the reddening, the mean reddening we find here might not be applicable for other other years.
